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Disseminated gold deposits hosted by sedimentary rocks of Mississippian age are common throughout the central and eastern portion of the Great Basin (Fig. 1). Although these deposits have a wide geographic distribution, the similarities in stratigraphic setting, size, tenor and the spatial distribution of gold and other hydrothermal minerals allow them to be grouped as a subtype of the “Carlin-type” of golddeposit. In particular, the presence of quartz or silica in a basal jasperoid is a characteristic feature of Mississippian sedimentary rock-hosted gold deposits. These deposits also have grade-tonnage relationships and total gold content which differs from the “average”...

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